I'm kinda just looking for opinions and see if anyone else has ever been through anything like this.

So my parents have always been very liberal and socially progressive outwardly. They've complained about others who aren't accepting of anyone nearly all my life. Also, throughout my time growing up, they'd tell me, "if you're gay or anything, you can tell us and you know we'll love you just the same." Based on that and after later discussion with them, that tells me they noticed I wasn't a straight/cis person. 6 months ago I came out to them as trans and at first, they were shocked but pretty neutral, just trying to understand. As the time went on though, they got more and more negative, saying that they think I need to be patient and go through "years of therapy to find the root of the problem" and that they don't think transitioning is right for me, despite claiming that they have no issues with anyone else do it. After a bit of them not really bringing anything up at all, they said what I believe they've been avoiding but thinking all along. They told me they don't believe transitioning is real, believe I have "serious mental issues", but that they love me just as much, will always be there for me, and want to help me find the help I need. Trust me, I know how seriously messed up this is. This is flat out bigotry, conversion therapy, etc. I'd like to believe they haven't just been a surface level ally all my life and maybe they're just still in some point of shock and denial stage of grief? Has anyone else had parents like this ever come back from being like this?