I'm not so sure that just because he talks like he does means that he thinks he knows everything or is prideful.
Some folks are bad communicators and/or awkward in social settings. They have a certain "repertoire" of topics that seem to work, to get them through the exchange.
Many times, these exchanges take place when the people know one another but do not know much ABOUT one another.
He knows you're into guns. What else can he talk about. He may feel awkward and not know much about anyone.... wait, here comes Bill, gun guy, I can talk about guns. Then when Bill walks away, back to the edge of the room with coffee and donuts.
These types of things are part of the price we pay for having almost entirely superficial relationships.
Bible verses for dealing with "extra grace required" individuals:
Colossians 3:12-14 Put on then, as God’s chosen ones, holy and beloved, compassionate hearts, kindness, humility, meekness, and patience, bearing with one another and, if one has a complaint against another, forgiving each other; as the Lord has forgiven you, so you also must forgive. And above all these put on love, which binds everything together in perfect harmony.
Luke 6:31 And as you wish that others would do to you, do so to them.
Romans 12:10 Love one another with brotherly affection. Out do one another in showing honor.
Ephesians 4:29-32 Let no corrupting talk come out of your mouths, but only such as is good for building up, as fits the occasion, that it may give grace to those who hear. And do not grieve the Holy Spirit of God, by whom you were sealed for the day of redemption. Let all bitterness and wrath and anger and clamor and slander be put away from you, along with all malice. Be kind to one another, tenderhearted, forgiving one another, as God in Christ forgave you.
Philippians 2:1-7 If you have any encouragement from being united with Christ, if any comfort from His love, if any fellowship with the Spirit, if any tenderness and compassion, then make my joy complete by being like-minded, having the same love, being one in spirit and purpose. Do nothing out of selfish ambition or vain conceit, but in humility consider others better than yourselves. Each of you should look not only to your own interests, but also to the interests of others. Your attitude should be the same as that of Christ Jesus: Who, being in very nature God, did not consider equality with God something to be grasped, but made Himself nothing, taking the very nature of a servant, being made in human likeness.