How do I bounce back from a negative working environment?

At my previous place of employment:

- I wasn't welcomed my my office colleagues. He was Dutch and just complained the whole time we shared an office about how he missed my predessor. No joke. It was awful as he started from my very first day. After I got more settled in, I just could not be arsed with him and he got a taste of his own medicine. I ignored him with silence after I reached out and asked what the problem was.

- my colleague was incredibly lazy and I picked up all the work. Yet they ended up getting a full time job there. My replacement reached out about them and their laziness and failure to show up at work (as they did with me) but again, it's all about who you know. 80% of the time my colleague was never in. We both got paid the same too. Such bs. I done their work and my own work.

- dealt with a sexist/racist colleague who subsequently got fired but before that there was a failure in management because he was good friends with our CEO. He spread some nasty lies about me and by the time people realised he was at fault I had already accepted a job elsewhere. Now when I apply for jobs I panic. Because I think OMG, I'm this colour and they won't give me the job.

My issue here is that work wise? I was excellent. No doubt about it. But socially, even as outgoing as I am, I don't really feel like I made friends there as I feel like most people saw me differently.

I understand professionalism but it was hard to understand how to operate in such an environment socially too.

My housemates went on my LinkedIn page and undermined all my work at these big companies I was at. Why? Because I stood up for myself when they tried to exclude me/said racist things, like "only white girls allowed" when I tried to socialise with them infront of company. I never understood why because prior to the "pretty girls" hanging out with us they were nice to me and we done things together - which raises the issue about beauty. I always feel concious of the fact that because I'm not "OMG beautiful" stereotypically people don't want to be my friend or get to know/give me a chance. Anyway, I confronted them about it. We no longer talk. They too spread lies and the truth eventually came out and proved my innocence. They were awful.

Yeah, how do I deal with this? Because I sometimes feel like "no one likes me" or they were pretending all this time because my so called friends there are no longer in contact since I left. Even when I wish them happy birthday. Hmm.