People have been being kind of aggressive forwards me when I go something off meta or try something different. last time i went miss fortune support and build forwards my ult and shredding, this guy got very mad and flamed me for trolling..off meta works too 
Normals are here to try new things and to play purely for fun so yea , you can play whatever you want , but remember your teammates may want to try hard so even if you go ADC Kayle or smth spicy let them know , have a plan how to win and try your best if you do all things i mentioned you are good.
In case of the sepcific MF support its even meta ( LCS not soloq ) but you still need to buy sightstone and play like a support ( vision oriented, dont steal farm , dont play solo try to support your adc and your team )
why normals only?
I mean you really shouldnt care what other people have to say. You are having fun and if it works and you are trying to win it shouldn't matter. As a support main i like to try off meta picks since the normal supports do get boring (as im sure its the same with other roles and their regular champion pool) its nice to try new things and it also helps you since the enemy team doesnt really know how to go against an off meta pick most of the time!
Kinda surprised they talked poorly about MF support. That pick was on LCS a while ago. It was picked with Ashe, so MF could ult off of Ashe's ult. It could work well with any ADC with hard CC, although it obviously means that the weakness of the comp (double immobile AD backline) needs to be fixed elsewhere.
I generally tell people going off meta is not trolling if you have an idea as to what you are doing. I've often received the usual "wtf are you building" messages and lately I just answer exactly what I'm going for and keep playing or I don't answer at all. It's when they say if I'm trolling that I'll speak up and ask how. Usually they don't answer to that. If something works for you and you know it can work with your team and it's not something like blue build AP Ultimate Bravery Riven (cause that's just...), I say go for it against the critics who aren't playing with an open mind and will flame what they don't get no trust.
I've had people react to why I'm playing Kennen or Kindred in the bot lane. Mixed results but there have been wins and satisfying results with it for me. One less than the other.
I've had people ask why I'm building Rylais on Garen as a 5th/6th item before it got nerfed. First of all we were ahead. Second of all I still get the health and slow. That's still 2/3 of the item being used. A game was thrown once. It was hilarious.
I'll build tank Annie in ARAM when there are no tanks on our team, the enemy team has a tank or two, and we have 2-3 potential shredders/carries. Why did they change her E? :<
Basically, even though I usually run these in normals and RGMs, I play by innovation over imitation and just playing the game as I see it as fun (as long as it's not intentionally choosing to tank my own team one member).
As for your support Fortune attempt, that sounds like a case of being an imitator vs an innovator due to the poor timing. I was all over roles with MF before it came back to pro play (even jungle for one game that I got forced into role swapping for it). Since it came back, I've stepped back from playing her from the increased flaming for just willy nilly bringing it as a support pick into bad match ups or just not having the sharp talent that a high elo player has which they apparently know of. I'm not sure of your reason to run the pick as a support and I do worry about that because if it's due to you seeing it somewhere (high elo/pro play) and you just had to try it, I would tread softly or filter it out as much as you can because the aggressive tone can be real.
