Am I the Asshole?

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The original was posted on /r/AmItheAsshole by /u/Inevitable-Draft4540 on 2023-10-07 10:41:42.

I (36F) have been seeing my Partner (40M) for eight months now and we felt it was time I met his daughter (10F) who he is a single father to. He has understandably been cautious about this and not wanting to rush into us meeting which I have fully respected. The plan was we'd go out to the Cinema then return to my place and the three of us would have dinner together.

We went to see Haunted Mansion and had a generally good time, she wasn't exactly enthused about our relationship which is to be expected as it's our first meeting but she wasn't rude either. I know it'd take time for us to grow close. At my Home I told them to relax while I got dinner started and my Partner remembered my hobby and asked if he could show my daughter my lego room. I told them to go ahead and they went off. Ten minutes later my partner came back annoyed and told me he couldn't take anything apart to let his daughter play with them. I asked him what did he mean while alarm bells were going off in my head and he told me he'd tried to take apart several of my pieces to let his daughter play with them as she wanted to.

I was angry at this point and told him that would be because i'd glued them together obviously and why would he think it was ok for him to even try and do that? he told me they're for children and it's not a big deal and if his daughter wants to play with them she should be able to and that if I want to make her happy I should be more accommodating about this.

I admit I just stood there for a minute not sure what to say before I asked him to leave and take his daughter with him as I wasn't in the mood for this anymore. He told me I was being childish and they're just toys, and asked what kind of adult I was to act this way. At this point I just told him to get out immediately.

I went to assess the damage after they left and several of my pieces had been moved from their shelves and tables clearly tried to pull them apart. Thankfully no damage was done. He has been texting me berating me for acting like a child and how he was ashamed of me and how i'd sent his child away without any dinner. I do feel a bit guilty over not feeding her when i'd promised to (to be clear they are in no way struggling and while I didn't feed her she wouldn't go hungry that day) but I was just shocked by his behaviour.

AITA? Should I have fed them? did I perhaps overreact?