"You clearly have no idea how the game works."
"As expected what are you 12? troll found."
"troll have fun in silver league"
"you clearly need some desperate education"
"do you understand simple math?"
"yep you clearly have no idea what are you talking about"
Plenty of rude comments from you within the forums when bringing down other members' opinion. I don't know if you like being talked to this way, AKA being treated like you have no sense of intelligence whatsoever, but I'm pretty sure a majority don't like being argued with with this kind of language and attitude. If your topic and general question make sense, members like that. But if you respond to everyone's challenge to your opinion results in just flat out calling them stupid, that diminishes your legitimacy.
If you already use multiple Black Eyed Peas already, then I guess those Brainstorm players are experienced enough to take care of constant boosting. If at this point in the ultimate league you're still getting demolished, start reconsidering and adjusting your strategy.
As a side note, leagues have nothing to do with determining if you're better than them. That person could've been expertly playing casual for a long time, then plays ranked every so often. Not every person lower in rank than you is guaranteed a new player, where they fumble with what a certain plant/zombie can do.