"omg you're such a bad player"

Could someone please explain this kind of toxic person to me, and why they think this way?

So I'm an Aatrox (Fairly new to him, and liking him) going against a Sion. He, and I start trading aa's at lvl 1, and it's neck-and-neck, and he activates my passive. He flashes away, comes back, and my ping spikes, thus getting first blood. it was after this point I had to refrain from fighting him, or be eradicated. So I did the smart thing. I poked, farmed under turret, and without pestering my jungle patiently awaited till I collected enough gold to get my core items, and what-not.

Apparently, that was thee dumbest thing I could do, and this is what made me a bad player. If you are one of these players, could you give me an honest response as to why this is terrible? Why refraining from fighting someone who will beat you if you engage on them makes you bad? Well anyways, Amumu pings "On my way!" and heads in through the river with his stun. I knock-up Sion, and impregnate (Now dead) an enraged Sion who doesn't kill either of us through his passive.

He gets mad that my jungler ganked, even though I didn't ask for the gank, and it's his job. What did Amumu, and I do wrong here? It was great team-work, and he was mad telling me how: "You're not even a good player." If someone has a gun, and they are trying to shoot you, and you're bobbing, and weaving, avoiding shots, and the person shooting you says: "Stop moving so I can shoot you!" Do you stop? Fuck no Sion I'm not engaging you knowing I will die. Because I chose to be smart instead of going in to give you a kill makes me a bad player. a bad player? I'm not a great player, but please don't assume my capabilities, and skill from one match you had against me that you didn't even win, nor win your lane.

TL;DR: If a player wants to shoot you, you're a bad player for wanting to avoid the shot.

Logic? [zombie-brand-mindblown]