Capote's biting wit made him very popular with the cognoscenti of his time. An invitation to his parties was highly sought after among the society set. His self-inflation/deprecation was both amusing and tragically attractive.

Publicly, he was a great personality, and the life of the party. You can see several glimpses of this in the film. Privately, he had many demons and personality defects. You see much more of this in the film, but it does not negate what a fascinating and gregarious person he was in his public life.

Yes he had friends but as many self-involved first people do he ended up offending them. DAvid Suskind, Joanne Carson, Lee Radziwil, Andy Warhol who as a kid idolized Truman to name a few.
I heard a rumor, they say you got a broken heart

When you're that famous and successful, there'll be plenty of "friends" kissing up to you, don't worry.

He had lots of friends after Breakfast at Tiffany's and In Cold Blood. After he lost his moneynot so much.
He lost his money? This is the first I've read of it. It's always been my understanding La Cte Basque 1965 is what sunk him with his society friends.

He had lots of friends after
Breakfast at Tiffany's
and
In Cold Blood
. After he lost his moneynot so much.
Morag

I felt it was 'exaggerated for the movie' because in appearances on the Dick Cavett talk show in the old days he seemed more likable. Maybe you can find them on youtube.
"Did you make coffee? Make it!"Cheyenne.

As mentioned in the film, he and Nelle Harper Lee had been friends since childhood. She seemed very loyal to him in spite of her apparent disapproval of many of his choices and the fact that the relationship seemed draining to her at times.
What Jack saw in him, I have no idea. Sometimes you can't help who you fall in love with even if the one you fall in love with needs a lot of help!