I think Sandi is right. Ok, dressing to blend is good advice if you want to reduce the number of people who realize you are crossdressed. But, dressing to blend isn't going to stop people noticing you, or reacting to you. People DO react. Generally speaking you won't notice them react if you are ignoring people and going about your business. If you are interacting with them and they react, obviously that's a different story. But, unless you are really passable, then people you interact with are going to know you are crossdressing whether you are dressing to blend or not.
Whether you dress to blend or not, it's context that matters. If you go crossdressed into a seedy neighborhood bar, you're inviting violence and there won't be anyone to help you. If you go crossdressed into a major airport, crawling with security, you'll very likely have zero problems. The amount of people who react very strongly against you is potentially high, but the number of people willing to actually act on it because they'll be instantly arrested is virtually zero.
