It's better not to comment on their opinion; it will only make a long thread of discussion, just like back then when some anonymous accounts spammed the comment section. ╮( ̄▽ ̄)╭
You make a thoughtful comment- maybe it gets replies and likes. You make a troll comment- guaranteed almost immediate replies and other trolls smashing like. LOADS of it. It's all about getting attention.
I feel like a lot of people are trolling right now.