It’s not that difficult.
If you listen to Ryan Pacyga’s’s press conference he stated there were text conversations a day and a week after the alleged rape and the woman was telling what bar she would be at, etc. Odd behavior for an assault victim. Then, the 18 month gap. Then, possible discussions amongst the women, possibly Abby Honold (inference) due to the timing.
Memories are malleable, suggestible particularly with the passage of time. Couple that with activists calling certain behaviors “assault” that are not legally considered assault (eg lack of affirmative consent or simply going along silently) and the current political climate it’s not hard to see how these situations develop after drunken encounters.
None of this is to suggest sexual assault doesn’t happen or is at all acceptable but there is a huge gray area and there still needs to be a preponderance of evidence, even for a guy like Reggie that has apparently rubbed a lot of people the wrong way over the years. But, even some of that seems like simple rumors and hearsay rather than personal knowledge.