How do i tell him to lay it off when he's drunk?

I love my boyfriend, he's really caring, lovely and frickin hilarious, plus i can't imagine someone more perfect for me. However, when he's drunk he gets really lairy with his friends and that doesn't bother me but sometimes he like includes me in the 'banter'. Like last night alot of us went to the pub to watch my friends gig. The girls were sitting on one table and the boys were sitting on another, getting really y and lairy. Our local band were also releasing there single in town so some of us wanted to go down there. I got up to leave and went over to say bye to him and he pulled me into him by like grabbing onto my and making me sit on his lap, i got up pretty quickly and just laughed it off, said bye again and walked away, as i walked away he slapped my and then i turned around and all his friends were like whispering something to eachother as i was walking away. It really annoyed me so i didn't text him back. I just think i need to be treated with more respect than that..