First off, I rarely dodge. In normals I don't really care about off-meta or trying something different at all. In ranked as long as people intend to be team players and contribute in some way if it doesn't work, I don't really care.
That being said, I said "in certain circumstances" and am playing devil's advocate for a moment.
What if it's another individual, or your team that's being toxic? Trash talking from the moment you get in the lobby? What if a toxic person is trying to force you to dodge? Should the people trying to play a game and actually be part of the team effort be the ones dodging when you've got one (or more) toxic players or trolls? If someone else is spamming chat with hate speech, bigotry, or is just a complete jerk as soon as chat is up, why should anyone else have a 6m timer?
or holding them hostage with a troll pick.
I've sort of done that before though it wasn't to hold the team hostage.
If I've got first pick, highlight my champ, and someone bans it just because they don't like it - well I'm going to make sure they don't like my next pick. You type in chat why you don't want it played, it might be a different story, but most of the time people will ban your pick simply because they're bad with it, don't understand your reasoning (like being in a party, it's not a strategy they've seen, etc), they want you to pick a specific champ b/c that's what they want, or even because they got autofilled and want another lane (but nobody wants to trade/they don't ask/whatever). Point is, they don't communicate, and just ban. Ok, that's totally allowed and not something people get punished for.
When that happens my response is I'll take a completely off-meta pick with the full intention of playing it as well as I can. Sometimes it works out, sometimes it's painful - but I'll go the distance. Also allowed, and tit for tat. You can do what you want, but so can I.
If the person banning banned simply because it wasn't their first choice, wasn't meta enough, they didn't like their lane (seems to be the most common), or whatever... they can dodge if they want but I'm not going to give them a free dodge. I'd rather try something completely different, whether it's viable or not, and since teamwork/communication are already lacking why not?
On a side note, sometimes doing that you learn new things... like Lux as ADC is actually kind of lulsy.