I've never really met any celeb or actor who was rude. The cast of Byker Grove (early 90s) were a bit up themselves though.
I've served beer to Denise Welch, Tim Healey, Jimmy Nail and Robson Green and they were all lovely.
I met John Rhys Davies at comic con and he was so sweet. Chatted for ages about my job and how proud he was of his dd.
James Cosmo (also comic con) was quiet but nice.
James Marsters chatted for ages.
Garrett Wang (Star Trek Voyager) signed an autograph for dd for her friend as he couldn't come to the convention and then tweeted him there and then and took a pic of him doing the signing.
Sylvester McCoy is lovely and very short.
Danny John Jules was so funny, with plenty of time for every one.
Ray Parks (Darth Maul) was so friendly, getting amongst the crowds and stalls and even did an impromptu lightsabre display.
All the GoT people I've met were fantastic.
Dave Prowse and a load of Star Wars people got a prop signed by everyone for a little boy in a wheelchair who was utterly gobsmacked.
I think there's a few more I've forgotten but they were all nice people.