Freedom of expression is fine, but discriminatory measures and attacks on the person are all forms of offences that have as their motivation or effect to harm the physical or psychological integrity of others is clearly justiciable and can lead to financial penalties, so Bitcointalk could "have" a certain "responsibility" by letting this kind of behavior repeated without the slightest distancing, sanction, penalty undertaken against users who do not respect the law.
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It is outrageous to read such behavior, as if this forum is a vent for repeated insults (see its user history
https://bitcointalk.org/index.php?action=profile;u=2461690;sa=showPosts) slander, disrespect are very often invoked.
I don't even know how people get offended by such remarks. If someone or a troll makes such remarks, just ignore them and see if it will break a single bone in your body.
This is the internet and worse still. It is a forum full of anonymous individuals. Why would you feel bad or affected just because some random individual who doesn't even know you just made what you felt like was an insult?
Everyone reacts differently, its his freedom too but as they suggest get yourself used to it.
If you find it offensive then attacking back is an option for you kna, you don't get an apology here by saying it's racism when the guy just doesn't express clearly what he just say. He must have doubt he is a doctor and I mean looks could be deceiving w all know that.