Cognizant Java Developer interview questions

After HR Interview they sent me a link to test my coding skills with 4 coding challenges. When I successfully passed with score 100, I was invited for a technical interview. During the technical interview, the interviewer constantly laughed. This is the first time I've seen such unprofessional behavior! Regardless of their feedback, in this company I do not want to be. The interviewer should take an etiquette course in my opinion! My advice - do not waste time with this company.