My manager laid off me because I failed to work on something no one told me to do

I thought managers suppose to give support to their employees whenever they needs. In my manager's case, he'll verbally tell me that 'if I need anything, just ask him'. Though when I really had stuff needs his help for once, he told me I should do it all on myself, and laid me off. Honestly, I secretly think my manager never liked me for he constantly put me on a team that no other team members want. He had me do most trivial works that can't deliver impact but only support other team members. He then told me I'm not able to carry on large project by myself. For the entire time I've been with the company, I've always been given tasks that no one else desires and for the final time I'm trying to push back, he laid me off. All I ask is to distribute those tasks evenly for each team member who aren't on a tight schedule. My manager said no, so all tedious stuffs have to come to me. (I kinda feel why - I was the only Asian girl on the team, rest of them are all Americans or Europeans guys. The cultural difference made it harder to win their heart) There was reorg in the company where we all were put on different project teams (that everyone likes) and one on-call team (to solve emergent customer issues). He put my on the on-call team for three months, promising since the second week (the nature of that team aims to be rotational at first) that I'll be transitioned to a project team any time soon, which of course never happened for almost 3 mo. Of course my manager feeds me with different kinds of reasons. On the on-call team, I was once the lead. My parents came visit me and I took three days off. My manager told me since have to take vacation, I can't be the lead for that team any more. However, from that vacation I took, things started to get weird. For the record, I never take more vacation than I have on HR system. On my end of year performance review, my manager wrote that I took too much vacation and violated the vacation rule, which he agreed to review my calendar with me but never did. Also during my vacation spent with my parents, my manager put me to solve an issue on the service I coded up, in order to unblock a big customer. It was my PTO and I was in the mountain, so I technically don't have internet. So I arranged our trip shorter in order to come home fix on the issue on Saturday. <-> For the fact that I never had a say on service config, we built it in a certain way even tiny changes have to go through a full deployment which would take half a day. I constantly working on the issue for almost five days since that weekend, mainly just myself, no one else wants to help nor my manager (he though always busy with stuff) con't