I have a good friend who struggled with stuttering and also the r-sound until he moved across the country and started speaking the local dialect. He never struggled with it again after that it seems.

Myself I couldn't see that our garbage bin was dark green or that my house was kind of green[0] until someone pointed it out. Now it seems impossible to miss for me, at least in daylight, but this fall I spoke to someone who was at my house and they was just as confused as I was.

I'm still partially colorblind but some colors seems to be just a matter of having it pointed out once, or seing it in the right light or something.

[0]: FTR, here's a photo of a house with the same color: https://byggebolig.no/eksterior-tak-ytterkledning-og-maling-...