The only reason to get mad at someone calling you a bad leftist is if you think it might be true. People will absolutely prey on your insecurity to make themselves feel like their chronic posting habit is praxis. The solution is to not be insecure. Be humble, do honest self-critique. Don't let lonely people work out their frustrations on you. There is a difference between pipe-lining and emotional blackmail.
This is good advice for life in general. People who do that should pick up a healthier way to self medicate like alcohol or vaping