People ultimately hate being told they're "bad" especially if they feel it comes off passive aggressive. I feel an immense sense of joy when people thank me for giving them advice, but 9/10 times they never respond or respond back negatively.
I think it depends on how you tell people. "Hey have you tried xyz instead of whatever you are currently doing."
Vs
"Fucking noob you suck st this game kill yourself or git gud. You should be doing this lololololoolollo why can't you play your job right".
Only mild hyperbole. People are dickheads on the internet and MMOs are not an exception.