Maybe its because of the many stories that come out of how very frum people are obnoxious themselves
Even if all those stories were true, and the frum people in the stories were 100% at fault (a premise I don't buy), how does that justify being obnoxious to any other frum person? Or for that matter to that same frum person at a different (or even the same) time?
Using such claims as justification, just shows a lack of comprehension of what it means to be in a service business. I think the overall Israeli mentality is one of arrogance, which results in a much lower awareness of what service is about, and it is exacerbated when it comes to frum people.
Just go back several posts and contrast my BA experience with my ELAL experience.
I will take that contrast a step further. I was once booked to go with DW out of TLV on BA. I specifically requested aisle seats across from each other, and was promised that that is what was assigned. Upon boarding, we realized that despite what we requested and were promised, we were assigned adjacent seats. I was (seemingly) obnoxious and refused to be seated that way. The flight attendants had threatened to remove us from the flight, which we said we would do, but they were not one bit obnoxious about it. Eventually someone realized what was going on and agreed to switch seats, and the flight left on time.