What do you think of Open Carry Texas and other gun groups trying to carry firearm in public places?

Three things.
Thing the first, I fully support the second amendment right to keep and bear arms. It is not the right to do so only if not seen. That would be like "the right to free speech, but only in nobody hears you." I fully support open carry. It SHOULD be socially acceptable.

Thing the second, I fully support private property. Not only does this mean you can OWN whatever property you desire, it also means that the owners of that property are free to allow or disallow whatever behavior they chose (within adjudicated limits). This means I fully support the right of property owners to ban guns on their property/business. Similarly, I support your right to free speech, but I will happily curtail it in my living room and invite you to leave if you go past the bounds of decency.

Thing the third, "because I can" doesn't mean "I should." I support the general effort of open carry activists. Exercising your constitutional rights shouldn't be something you have to do in secret. Since there is a phobia (and we could argue reasons until the cows come home) among a large percentage of the population, it makes sense to try to show that you can carry a gun openly, without being a weirdo. It drives a needed conversation. However, there is a line between "making a point" and "being a d*&k." Unfortunately a small percentage of activists fall - or jump - into this category and make the rest look bad, creating opposition where there need not be any. Pun only slightly intended, they are guilty of self-inflicted GSWs to the movement.

Prime example: Starbucks had a very sane policy - "We support our customers following the law. We have no policy for or against open carry." [paraphased] They maintained this in the face of anti-gun group lobbying efforts. A HUGE win. It was pissed away by "National Starbucks Day" [or whatever it was called] morons gloating and insisting on taunting SBUX customers. Now starbucks has a "please don't" policy. (Note: They have not BANNED guns, just requested so far. Remarkable restraint). Same thing with Chipotle and the current spat.

If the open carry advocates hadn't had such a big chip on their shoulders....

You hit the nail on the head - these people are LOOKING for attention, and then complain when they get the type of attention that they know they're going to get. Seriously, I have multiple guns in my home and am a big supporter of the right to own and concealed carry. But do you think I want to take my kid up for ice cream and have jackasses walking around with AR-15s strapped to their backs? These are idiots with nothing better to do who are looking for someone to challenge them so that they can throw their opinions into other people's faces.

I am all for open carry, and concealed carry. My reason is personal and societal protection. In places where everyone is armed, or is assumed to be armed it seems like crime (violent crime) is a little lower. Not too many people are going to try and rape or mug someone who might have a weapon. I don't have evidence of this, but that is my personal feeling.