Kenny Baker has stated many times that Anthony Daniels goes to every Star Wars convention as long as he isn't there. I read an interview about 10 years ago, he said he went to an award ceremony and saw Anthony Daniels there. As soon as Anthony saw him he left.
Anthony Daniels has never stated why he didn't like Kenny Baker. It was solidified as truth in Bring Back Star Wars when he wouldn't go if Kenny Baker was going to be there. Even Peter Mayhew and Dave Prowse has said they don't get along.
Aren't they a little too old to be fighting like kids? Maybe youthfulness stays with some people for ever.