No it’s not acceptable. Unfortunately many people are in shidduchim who shouldn’t be, and many people get married to unhealthy people and miss the red flags. I’d say this is a red flag.
Also my Rav holds it’s assur to back out of a date, depending on the situation, but once you said yes, you said yes. Unless you find out that the potential spouse is a murderer or has major issues or something really big. If he’s a regular guy and you just heard something you did’nt like so much, too bad.