So if I drive drunk and mow down a few people... I'm fine as long as I didn't mean to kill people after driving drunk?
Intent doesn't always matter, and in this case of puerile humor it doesn't matter.
The world could be 99% white, and if I spoke from the perspective of a white person, as if white people are God's gift to humans, I'd be insensitive to the 1% of non-white people. I'd be instilling in the minds of non-white children growing up thinking somehow they are worth less, and are lesser human beings. The whole point of political correctness is that you don't have to actively say negative things about other people, races, or religions to have a negative effect on them.
I may not have intended it because of ignorance. I may not have intended it because I have never met a non-white person, and everyone I've met has not been offended by it. But that does not mean my actions are without real consequences to non-white people who happen to hear me when passing by, or from normalizing this action so that later other white people end up adopting this attitude in front of non-white people.
The titstare app is pure and simple objectification of women. That 9 year old programmer is coming into an industry and shown that the most interesting thing about her will probably be trumped by her breasts. She's being placed into a culture she can't genuinely adopt (unless she's bisexual or lesbian) because she's not a man. This is alienation. It may not be intentional, but it does have negative effects due to ignorance.
If you take away the sexual, objectifying context, the joke's no longer funny. "EyeContact" isn't an app.
It really doesn't matters whether they were trying to diminish a class of people's humanity and reinforce the widespread idea that that group's autonomy is subservient to straight men's desires, or if they were just exploiting that dynamic because they were too incompetent, lazy and uncreative to produce something of value and didn't care that the dynamic they were reinforcing is demeaning and harmful. Either way, it's worthy of scorn.
"I don't work for the NSA because I want a universal surveillance state: I just work here because it's hilarious when I tell my relatives that I know their shopping lists!" It being a joke doesn't make it better.
simply put, intent matters and people need to accept that a reflexive hostility towards puerile male humor does not advance the cause of women.