If someone is gloating, they are showing pleasure at their own success or at other people's failure in an arrogant and unpleasant way. [disapproval]
He had never been a malicious man, certainly not one to gloat over the tragedies of others. [VERB + over]
This is nothing to gloat about. [VERB + about]
[Also
VERB]Synonyms: relish, triumph, glory, crow