Lots of opinions about former VP Biden (who I will call "Mr. Biden" per US custom) being denied Holy Communion. Most of the opinions are uninformed garbage. Here's a quick overview re: when / how someone is denied Holy Communion.
All baptized Catholics, by default, have a right to the sacraments that they can receive. Sometimes, your life prevents you from receiving a sacrament.
e.g., I do not have a right to the sacrament of Matrimony b/c I'm celibate. 1/
However, if they approach for one of these sacraments, they can be denied if and only if they are "manifest grave sinners." 2/
This is where Mr. Biden comes in. Voting to protect abortion "rights" is clearly grave matter for sin. That he voted like this multiple times is much, much worse. 4/
1. Make a good confession.
2. Publicly renounce his prior public support for abortion.
A public crime (not sin, but crime) must be repaired in public. 6/
"I still cry about it from time to time," he admitted.
I've clearly touched a nerve and lots of folks are upset. If you, who claim to be a good Catholic, intend to reply to the hateful comments of others with insults and derision, please move along.
You're not helping.