Air France was fined Rs. 40,000 per passenger by an Indian court for racist behavior against its Indian passengers and did not serve them meals onboard their flights. A few years back when flying Lufthansa I too observed a very unfriendly attitude by the ground staff in Frankfurt towards many Asian flyers.
I also saw a very unfriendly attitude in the air by Air Austria staff and extremely rough behaviour at Vinenna Airport where flights were delayed due to winter weather, but there was inadequate information to passengers.
Personally, I have experienced lousy service by Lufthansa's Miles & More program, where due to errors they had missed 14 of my flight! Even after writing to their program director, he refused to give me credit while accepting that I had indeed flown those flights, but because in their computer my name (there was a mistake in the way they had entered my name) did not exactly match the name on my tickets he would not give me the credit! Disgusting!
I really don't know what Indian passengers choose to fly these rude European airlines and I can imagine its obviously due to price. I guess that is why every advertisement by Lufthansa and all these other airlines is about cheap tickets! Not exactly the best way for them to stay in the black.