I also dont' agree with having a high rapid rating and low bullet rating. This is natural for most people especially us older folk.
A few 100 points difference is fine.
But for example I've reported people in the past who were 2400 rapid and 900 blitz and 900 bullet with a 10 highest for their puzzle rush... I've only seen 2 or 3 people like that, but it's obviously a very extreme example, and worth reporting.
Also report every single person you lose to.
BRUH
Chess.com probably receives thousands of incorrect reports every hour. It's all automated, and one of their highest priorities is to avoid false positives. It doesn't do your opponents any harm to report them.
And don't think it's an ego thing... I definitely wouldn't report every person I lost to because I thought they were cheating. I'd report them because maybe 1 out of 10 times it'd be a cheater that I would never have suspected.