Yeah, I've played as a hyena in the past as well, there's always that one group of lions who will claim that you're trying to harm their loved ones/pride members/etc. As Lovi said, I also believe they do this because it makes their RP more interesting and/or develops their plot. I think that sometimes it's okay, but at other times, when you just want to hang out, it's just plain annoying to have a bunch of lions after you all the time. Just because you played along that one time.
I wouldn't say it's very problematic but like I mentioned above, it can get annoying rather quickly. Most of these lions and hyenas are big fans of TLK movies/shows, where the hyenas are presented as the bad predators who want to harm your cubs, yet the lions are the high and mighty predators, who protect everyone and keep peace.
I guess these RPers just think that they have to follow these stereotypes. x3