Am I in the wrong?

Anonymous
My stepdad and I use to be very close he was with my mum for 15 years but unfortunately she passed away recently and I miss her terribly. My stepdad has met some woman and I thought she was nice at first but is always rude to me telling me I need to eat more as I'm slim but I do eat and just mocking me, I recently had an argument with my stepdad and he said I was being rude to her when I wasn't I simply just said you're dog keeps annoying my cat which she does and then my stepdad had a go at me saying I was being rude towards her, they don't include me in anything and they both seem to pick on me abit in a jokey way but I dont find it funny as just lost my mum not in a good frame of mind etc I don't know if I'm being unreasonable or they are and would it be better to cut them off? The girlfriend always seems to give me funny looks too and she's a big girl but always seems to go on about her looks and calls herself fat in front of us both.
Am I in the wrong?
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