Probably because the gay scene is more developed although certainly not like Brazil and more members have actually been there.
I did not find Bogota unsafe but I am a seasoned traveler , leave my jewelry at home, same for camera . Don't flash big bills. About the same way I'd behave in Miami, LA or NYC, Rio etc.
I think Medellin is a beautiful city and if you are into using the apps, plenty of opportunity as there is in Bogota.