Color in Sentai is, to a degree, reflective of general association of those colors. In early Sentai, Yellow was perceived as a very masculine color, while after Magiranger, people had a hard time bringing it back to male characters. Pink seems to be becoming a bit more neutral these days, so there is a chance of there being a male Pink Ranger at some point- I mean, we have a non-villain female wearing Green this year too.

Ex Aid primary color is pretty much pink I wouldn't be surprised if we get a pink male ranger in the future.

KR and sentai are directed at different audiences; I don't know how willing TOEI is to market a pink male ranger to little boys. I don't see anything wrong with having a male pink, but I also don't run a multi-million dollar company

Wouldn't preteen boys, who I assume is Kamen Rider's primary demographic, be even more against pink then a 3-5 year old boy? I'd imagine what's socially acceptable plays a bigger part in this sort of thing then what colors they actually like and preteen boys seem like they'd be especially nasty when it comes to making fun of somebody for liking pink.

Kamen Rider is not color-coded though. While we had pink Kamen Riders who were female, the colors vary much more for each character than in Super Sentai. Also, looking at the shade of Ex-Aid's suit, it's more purple-ish than pink, while Decade's color was determined by the camera motif (that's where the "It's not pink, it's magenta" meme came from). So technically, we can't really talk about "Pink" main riders either. Marika was pink. As in, hella pink. Pink Necrom was black and pink. And KR Poppy has some pink elements. But those three are the only female Riders who have pink as a main color in their design.
I think Kamen Rider being more varied in colors and associations in that sense gives them a bit more liberty when it comes to the whole pink issue.

I think this is only a matter of time.

I never thought about that color coded thing. I guess it has more to do with the history behind color rather then the color itself in this case. I don't think Ex-Aid is purple-ish pink. I think he's straight up pink. But really, this wouldn't be the first time I've been "off" when it came to colors so I won't say anything more.

You know, I go back and forth on this topic.

On the one hand, yay gender diversity for all colors!
On the other hand, why let a man appropriate the only female-exclusive color in all of Sentai?

And I go back and forth on that forever. :lol