Online Kindness Matters

Are my friends toxic based on their behaviors, such as being passive-aggressive, screenshotting conversations and making fun of people, sharing pictures of people they consider ugly and saying awful things about them, and often talking horribly about others without addressing the problems? I'm a sensitive person, so I try to keep that in mind. I find it hard to be vulnerable, engage with them, or push back without second-guessing how to phrase things because I see how they act about others when I'm around, and I don't want to be on the receiving end of their behavior. I regret not pushing back more. I've had this limiting thought: when I've pushed back and they've acknowledged their behavior, they seem to be aware and double down on what they call being 'shitty.' I'm struggling to distance myself because I enjoy the good times with them, but I'm finding it hard to get to those times and make it worth it. I feel like I look too much into their behavior, trying to figure out if they're mad or whatever.