This was something that happened at Christmas, but its been troubling me since it happened. 

Over the holidays, my boyfriend was meant to stop by my parents house to stay for the night before we both headed back to his place. Because he doesn't currently have a car, his parents would be driving him to ours. When he told me this, he said something along the lines of "my parents will be driving me, but just dropping me off." I interpreted this as they would be dropping him off at the door, and they would be heading straight home since its a 30+ minute drive and it would be dark, and this is what I told my parents before he was meant to come over. 

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Now I want to say this as nicely as possible, but sometimes my parents can be bad in social situations, especially my mum. Another example of this was when a few months back my friend had come by to visit, and when my mum walked into the hallway we were both in, upon seeing my friend (and my friend clearly seeing her) she immediately walked out without saying anything or greeting her at all, which my friend was obviously hurt and confused by.

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I was worried something like that would happen again when he arrived with his parents - that they wouldn't come to the door when they arrived and say hello, even though they would obviously be in the house, and that his parents would be confused or find them to be rude. So, about 30 minutes before they were meant to arrive I asked if she and my dad could just come to the door and introduce themselves before they left, which almost immediately upset her. She asked me why they had to if "they were just dropping him off." When they did arrive, my parents introduced themselves and then my mum invited them in, which I wasn't expecting. However, at the time I thought that part had gone as well as it could have: our parents seemed to get along okay, and nothing was too awkward, but my parents didnt really have any food or beverages to offer them except wine. But after his parents left, my parents were very upset with me. My dad said that when my boyfriend said that his parents were just "dropping him off" that it obviously meant that they would be expecting to be invited in and that I should have realised that. When I was leaving the room, I heard my parents say that they "obviously can't trust anything I say." And now my mum is convinced that my boyfriend and his parents think they're horrible - and when I ask her why she said its because when they were invited in they didnt have anything to offer them. I have told her multiple times that this isn't true, that after my boyfriend said he thought it went well, and that his parents wouldn't judge them like that, but it falls on deaf ears I think. 

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I really don't know if I messed up, or at least, how badly?  Was I wrong in assuming that "dropping off" just meant dropping off at the door? Was I overthinking everything in regards to making sure my parents introduced themselves to his when they came over? I will admit, that I was extremely anxious that day and I might have overthought everything too much, but I don't know.  I feel like maybe there was some miscommunication at some point, but I can't pinpoint where. 