" May ALLAH show u the right way."
Whoever that person was, he prayed to God to guide you, whats wrong with that? It is his belief and he offered his sympathy through praying to God to guide you and protect you from a torment that awaits unbelievers. You could have in return said, thanks for praying for me, .........
I don't see anything wrong with the last sentence " May ALLAH show u the right way", what he said before is could be due to he wasn't being serious. I agree with you that sometime it does leave bad impression on faith, but hey everyone is not perfect and you have allow for concession in some cases.
Anyway
The comment was blatantly condescending and immature.
I tried to debate the existence of God on Ummah and had people saying "I hope you find Allah but I won't bother listening to a disbeliever" (the "k" word was chucked in there, I don't know what it really means or if it is an offence). The whole notion is very condescending and immature, and that's obvious though.
We had a Christian man who said in the newspaper that he felt "sad" for disbelievers because they were living "arbitrary lives" assuming that people who don't believe in their God, with no proof, are living lives of no purpose, which couldn't be more from the truth.
Religious people, by playing themselves as being holier-than-thou, are always going to be condescending in nature.