Turkey has become more conservative over the last 20 years. I have friends from Istanbul that feel this is over simplified in the foreign press. If you are there waving around a pride flat, you're inviting to be harassed verbally and probably physically if they feel you are disrespectful of their traditions and Muslim beliefs. If you're going about your own business in a respectful manner, you probably won't even be noticed. Even though it is a Muslim country, large cities like Istanbul have a good size gay community. Some incredibly handsome guys there. One of the legacies of thousands of years of invading forces to control the gateway to Asia and Africa along with the movement of goods (including people).