Apparently (per Brady, during Brady's press conference) during their very brief postgame hug BB told Brady he'd stop by after the game. So what looked like a very very short and not crazy friendly interaction after the game was obviously not the real thing - they spent quite a bit of time together.
Brady and BB both said this week at various points how nonsensical the speculation and "reporting" about their relationship has been. They were both like (and I'm paraphrasing here), look, we were together for 20 years and had incredible success. Of course there were moments when we were frustrated with each other, but we wouldn't have stayed together this long if we didn't have a good relationship.