Teenage boys - question about friendships

[MTGGirl]

My boy (13) has a classmate and friend who spends 2 days a week at ours after school every week for almost a year now, they have common interest (magic the gathering and D&D).
We had the weirdest convo with this boy today. Related to another topic he dropped in that at our Friday night magic gathering (every friday loads of people gather in a comic shop to play cards, ages from 9 to 50, mostly late teens/early 20s) nobody likes my boy. When I asked to elaborate he said because he has a very annoying deck that he plays with. Then I asked does he hate XZ because he has annoying decks and keeps winning? He said if the likeable things about a person outweigh the annoying things than it's okay, but with my son , he thinks, that's not the case.
I got really pissed and nicely asked how come he is here at our house twice a week?
Then came an explanation about how their friendship is a love/hate friendship and they annoy each other in equal measures.

Now, I have never been a teenage boy, obviously, but this strikes me odd.
And infuriating. I know my son's flaws, and I am aware that he is slightly anti-social and can be autonomous or hard headed. But the description that no-one likes him either in school or in the other setting kind of hit me.
I am there every friday playing as well, keep an eye on both boys and know full well that my son wouldn't win the most likeable kid award, but this goes way too far....
Is this love/hate friendship a real thing, or is this kid just comes over because he doesn't like ot be at home?

...and this boy is welcome at your house because? He wouldn't be welcome in mine.

What @brizzlemint said

I wouldn't take him very seriously, tbh. Kids can talk rubbish (even big 13yr old ones).

I might ask my DS if he enjoyed being friends with this person still, and remind him that he should only bother to have friends who are nice people. Let them sort it out themselves, otherwise.

I think at 13 it's up to your son to manage his friendships on the whole - if he is happy then as someone said already - the other boy might be trying to sound cool or something - it might be total nonsense.

It's good you are aware so can have a calm chat with your son - but I wouldn't interfere in their friendship if your son is okay with it.

Thanks :)
I wrote this so I won't tell the kid to just f...off.
I am not going to meddle in my son's friendships. Had a chat with him (DS) in the car yesterday and it turns out that he likes the kid, so it's none of my business.
On the other hand his friend is a weird kid, so it actually might be that due to his EQ being almost 0 (okay, being nasty here) he really had no idea how hurtful his off-hand comments were.

Sounds to me as if the friend could be on the autistic spectrum - no filter/ social graces and says exactly what he thinks??