Definitely experienced this (long ago) when I was dating. Lost track of the number of times that women told me I was “too nice”. At the time, it was very frustrating; however, in hindsight, it turned out to be a great filter. Any women who thought I was too nice failed the “Sanity test”, which helped simplify the job of eventually meeting my wife.
IMHO, women who reject guys who are “too nice” deserve exactly what they get.
Generally when women say a guy is “too nice” they are just saying that they don’t want to date. That’s one of the “outs” considered polite by women. Ridiculous, maybe, but better than men who when they don’t want to be bothered with a woman, brush her off, sometimes, in the most awful ways...some men are very cruel to women they are not attracted to.
The older I get and the more that I have (to lose in divorce), the more I seek sanity, so testing for it early is crucial.
You don't get many workarounds in life with a sanity test failure, just pain and expenses.
Personally, living single isn't the best way to go through life, but I think it's better to be alone and looking for a right one than being with the wrong one. Less damage all around that way.
Marrying well is its own reward.