Is discrimination acceptable?
Discrimination is acceptable when its intended to protect yourself and others and because of personal choice and opinion( or if your making a joke). It's not acceptable to discriminate against somebody because of their race, gender, sexual orientation or their physical body traits these things can be changed but most people don't have enough money to change their appearance and this would make the plastic surgery industry very rich considering all the ugly people on the planet.
Discrimination is also used a lot since 9/11 in airports. It is most commonly used against Muslim travelers because the terrorists that were behind 9/11 were Muslims and the airport doesn't want to take risks with their customer's lives( not that they really care about their customers, they just care about their money but it sounds nicer if you say they care about their customer's lives). Besides imagine the amount of flack they would take if another plane jacking happened because they didn't take precautions.
As far as discriminating for your personal choice goes it could be as simple as finding somebody to live with who listens to the same music as you, believes in the same religion, has the same interest, same sex interests, different sex interests or doesn't smoke( or does smoke which ever you prefer), whatever floats your boat. All of these things would do no harm to discriminate against if anything it would have a better out come because you would be living with somebody who you would get along with. Or when your looking for love interests it is okay if you decide you don't want to be with somebody because they have children because who the hell wants children especially if there not even yours that's someone else's mistake .
Having an opinion that people may consider as discriminating is also acceptable in someways like a woman wanting a woman doctor because she would feel more comfortable or a guy wanting a hot woman doctor so he wouldn't mind going to see the doctor. Or if your a business owner and your hiring and you decide you want to hirer a woman and not a man you should be aloud without anybody complaining because let's say your looking for a secretary your going to want a woman( preferably attractive) if your a guy. But many discriminatory opinions are not acceptable such as hiring somebody that's white that has no qualifications rather that a black person who has the qualifications just because you would rather have a white employ.Or not hiring a muslim because your scared that he might blow up your office.