Yup. People who don’t see the difference between the two are not effected by the difference between the two.

Problem is not even LGBTQ+ people, nor women, nor black people have a real big difference between Biden or Trump. Because at best, Biden is no worse than Trump.

but I have had conversations with self described communists who don’t care at all about minorities

So have I, and from the little conversation I've had with the few of them it was quick to realize they are not communists, but posers, reactionaries and people who've read to little and jumped only on the aesthetics wagon.

My takeaway was they became communist when they learned they could guillotine people.

Those fuckers are the worst. A communist outright glorifying violence, compared to one understanding it's need is not my comrade.

I have had conversations with self described communists who don’t care at all about minorities.

There are those who co-opt, historically. And in modern day, in the US, there's patsoc MAGA communists (though I'm not sure how much they actually exist beyond online bullshitting).

But I would also ask what you mean by "don't care at all about minorities," like if they have actually expressed such things to you and in what way, or if you're inferring that from something and from what. Because sometimes there are disagreements on what is actually going to make a difference and that is taken as a lack of interest in caring what happens, in bad faith. For example, democrats in the US who shame people on "the left" for not supporting their blue ghoul because the red ghoul might get in, citing that their disinterest in validating the blue ghoul as a candidate means they don't care about XYZ issue minorities have that the blue ghoul pays lip service to.