preplexed,touch eccentric

Now that he's come out of the closet his passion for classical music has been renewed with a vengeance. Most nights after work he locks himself away in the old Laura Courthouse and practises. He now plays with the Hayden Orchestra in Adelaide and if his mates in the forest thinks he's a touch eccentric his serious musician friends are also perplexed.
Hi

What are the meanings of touch eccentric and preplexed here in this sentence?