It would be best if you were friendly with everybody. But you should not be friends with everyone. Big difference. Be polite and warm with people you meet. Be the gentleman. Make them feel comfortable in your presence. However, only allow the few people who meet your criteria for friendship into your circle. Yeshua had 600 followers and twelve disciples. But whenever He had only three in His cycle, they were Cephas (Peter), Yaakov (James) and Yohanan (John). And only one of them, Yohanan, was His confidante. Decide what your life principles are, and only allow people who share those ideals into your orbit. Otherwise, you will let in your Judas, who will kiss you and then kill you.