I was one of the first people to join an online meeting with coworkers today. Usually, most attendees are up to 10 minutes later before the actual meeting gets started. One of my senior colleagues, Brick, mentioned during the early part of the meeting to a colleague (before everyone else joined the call) what I felt was a sexist joke, and then went on to brag how he was generating patents from a project he had done years back in university, making tons of money from it, etc. I then mentioned, "wow, can't be that hard being a privileged white male, can it?". I get chewed out by the guy who went on a rant of "being white/male didn't pay the tuition or rent or give me automatic 'A' grades; others have it harder than me, but it doesn't mean my accomplishments were easy". He repeated this twice more, and on the third repetition, I was honestly scared with how loud and angrily he was shouting out his point. More people started joining the meeting, and it continued as if nothing happened.
4 hours later, HR pulled me into a meeting with the guy, and the audio clip of my comment and the first (mostly calm) iteration of his rant is played, and nothing else (including the sexist joke earlier and the screaming after). I'm apparently being put on leave for 2 weeks while this is investigated, and have been warned that I'm being investigated for "sexual harassment" and "racist abuse" of a colleague, and if HR decides this is an offense severe enough for firing, I even lose my severance pay (7 months of pay) and health benefits (I'll be homeless in 3 months at that rate).
My laptop access has been revoked (IT remotely shut it down and it won't power on), company cell no longer works, and I can't access e-mail via webmail. I've just been told to stay away from the office until the investigation is done, and use my time however I best see fit (i.e. read up on topics that benefit my own work, "don't burn out", etc.). I've tried to reach out to HR and inform them that important parts of the meeting recording would be helpful, but Brick can't find the original file. I've tried reaching out to Brick to apologize (even it's fake; I can't afford to lose my job right now), and he just blocked my number after the first call.
How can I get HR to listen to me and get a handle on this when everyone is refusing to accept my calls and e-mails?