Does my family have the right to be offended by her family?

My bro got married today. Me and my other family members had only met the bride once. they've been together 6 months. i know it was a little fast but ok here's the real question. for the bridal shower we ordered pizza and the bride's familt stampeded first in line for a plate of it now my family waited behind them, no big deal and right when it was time for the first member of my family in line to get pizza the brides mother cut in front of us without even saying excuse me nd served the few members of her family who hadn't gotten in line before us. when me and my sister were introduced to her family nobody acknowledge it and just talked over the announcement. here's the kicker... at the wedding nobody informed my family of when or where they'd be taking pictures. they told us all to go to reception hall after wedding and i guess they took pictures but half my family missed it including myself! ant believe nobody told me!!! on to the reception... my parents thanked all of her family for coming to their son's wedding while her parents didnt greet anyone from my bros side of family. we had to wait an hour and a halffor food because someone screwed up the chicken order. they had all the rest of the food out and my 5 yr old neice was crying because she was hungry and they wouldnt even let her have a pickle he screwed up part is we all had to wait 1 hr for cake after eting because the bride's nephew didnt want cake he wanted donuts so the brides father left the reception and held us all up an hour to ride out half way across town and back to the kids favorite donut place. they didnt let my dad hve a dance w the bride. my dad had a toast planned and i wanted to congratulate them but while my family was talking in a hall they poured champagne and her sister toasted them and nobody notified us. then we asked to toastand they said "it was already done". we all got to set out gifts on a gift table and the bride's mom rearranged the table and set our gifts behind all of thiers so theis were the only visible ones. my family feels very disrespected as if they did not try to include us into anything. I understand they met and took things very fast in a short amount of time so we all really didnt know each other but why couldnt they make an effort on including us or making us feel welcome. plus, we overheard them making nasty comments about our family like how we dressed. it was kind of insulting. i feel bad for my brother as it wasnt his fault and i cant be mad at the bride because i don't know her and it wasn't her doing these mean things, it was her family. my family is just feeling hurt. are we over reacting or was this a slap in the face?