Well it's less a bad ending and more a neutral ending, it's not the true ending. It's the most common ending to get.
You get that ending for wining the first fight, losing any round, and then beating the last stage.
It's a fucky situation.
The true ending aka the hardest to get ending has an extra boss fight. Which I'd take that as the cannon one, but to get it you need to not lose a single round.
There's 5 Endings? I think.
Lose first fight lose last fight("Grooming—") potential gender change.
lose first fight, win last fight ("No gender, focus on the future") no gender change
win first fight, win boss fight loss a round ("I'm a girl end") gender change.
Win all rounds, lose to final fight ("do what will make you happy in the Future") no gender change mention
Win everything ("You're strong now Bridget" true end) no gender change mention.
More than anything this situation it shows how misinformation is common with that community and they will not hesitate to overreact to the smallest of crumbs.