I've been in this lab for a year (one year Master's finished and three years to go in PhD in marine ecology) and I thought my PI was great (chill, kind and supportive) despite forgetting absolutely everything, never meeting our deadlines, etc., frequently leaving super early or not showing up for days and almost never being seen in the lab. I'm fine with this but deep down I became convinced that he doesn't care about his job or science that much, sorry. Unfortunately, I have a feeling that by accident he knows that.
A few days before Christmas I'm still coming in and he wanted to have a meeting earlier than usual, I said I might be late because I'd moved back home 2hr drive away. I came in 20 minutes late in the end and very apologetic but he seemed happy with me. I told him that I'm leaving super early to pick up my grandparents who live ages away to drive them home for Christmas, I had to finish an experiment and show him the results but he offered to do that tomorrow afternoon instead. So I left early as I said. A few hours later he sent a nasty angry email that he came back from lunch and I didn't see me in the lab and I was also late that day and I didn't communicate (?), I was also late some other time before this, therefore I have an attitude and the conclusion was that although he is ok with me, no one else would ever tolerate that.
It's very rare if I'm ever late and recently I worked nights and weekends for a month to finish two months' worth of work which had to be done before Christmas and I thought he's meant to be happy with my progress. And I literally emailed and told him about both being late and leaving early, he didn't say anything against that. So this email really shocked me (it didn't sound like him at all) and I expected an apologetic email that he had a hard day, etc. but no. I showed up the next day and he's all happy with me again pretending that nothing happened. At one point I tried to explain something, he suddenly interrupted me with "see- you're just not communicating!"
I don't know how to interpret this but I don't like how he seems to bottle up little grudges and then spill them out in a mean email just before the holidays so that he won't have to deal with me for a few weeks. I know I'm socially inept but I try my best and mean well, his own communication and manners were never exemplar and this projection just scares me. Has anyone gone through this? And how would you respond to such an email?
It is technically possible to change advisors but I've heard it's complicated and my funder may not approve. I'd prefer to avoid that, I feel as if it's fixable I just want to approach this correctly.