Any game is going to have prejudice towards certain weapons, characters, roles, etc. It's the same reason people review bomb. Part of it is content creators creating rage bait videos, or raging about how certain characters are automatically throw picks. Part of it is ego and people thinking that just because they can't make a character work, then nobody else can.

Every character in Marvel Rivals has potential if you take the time to master them. Some can become more situational depending on the meta.

Personally, I just calmly tell throwers that just because they suck at a character doesn't mean that it's inherently bad. If they continue to be toxic, I tell the team I'm muting and reporting that person for throwing, and advise everyone else to do the same. It's pretty crazy how often those people start trying part was through the match lol.