I've laughed during a wake but never at a funeral. Sometimes things are just funny and the more you try to tamp it down, the funnier they are.
Second, the guy was 95 years old. It's not like he was cut down in the flower of his youth. My grandmother passed away earlier this year, in her 90s. People weren't mourning, they were celebrating her life and talked about the things she had done.
It's also a bit odd to condemn him as a communist, then point out the immature behavior. If he was that big of a dirt bag, he deserves no respect in death either.