If the problem is the contact itself, try just subtly interrupting it - stopping to tie your shoe while you're walking or something, and starting out walking a few feet further away so he can't have his hand on your shoulder.
If you're concerned about him coming on to you, wait till it happens and just be honest - sorry, I'm not gay and I'm not interested in you as anything more than a friend. Simple - same as you would say with a girl who liked you and in whom you were not interested.
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"If ten million people believe a foolish thing, it is still a foolish thing."
- Anatole France
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