I have a bit different view on that. I am not the best listener on this planet. I always do 100 things at once, have racing thoughts and have poor attention span. I don’t do it on purpose.

I prefer someone pointed out to me that I just ignored them talking and how it made them feel. I’d be very apologetic and will continue trying to be more mindful.

I think calling someone rude and simply walking away is a bit extreme imho. I agree about standing up for yourself but maybe you feel bad because how you went about it. Also if this person always behaves this way, they likely aren’t interested in hanging out and if likeky just keep my distance. Is this person your friend or someone totally random?