PayPal interview questions

Applied online through their careers page. Later one of the recruiter contact me for initial phone screen. Took two to three weeks to set up a phone screen. First round was initial phone screen with technical questions and one data structure related question

Initial phone interview with manager. he is very knowledgeable.second is also phone interview is also good.then on-site interview with 4 round.one of SI interviewer is very arrogant.not even very knowledgeable.didnnot complete Ans. Of the question.why such type of people play with students future?