Chris, I wouldn't worry about some asshole at the gym who probably can't run around the block and is probably overweight. You're doing the right thing by combining weight training with your running - it well help you out with injury prevention. There's nothing wrong with being a thin, lean guy, especially when you are a talented distance runner.
Like everyone has mentioned, gaining 10-15 lbs. of lean muscle requires eating a ton of food with your activity level, and is probably almost impossible for a 70 mile-per-week runner. If gaining this 10-15 lbs. of lean muscle is your priority, then you have to take it on as a "season." Cut way back on your running (substitute quality and intensity for quantity), eat a whole lot more, and focus on a hypertrophy program. After you build your muscle up, re-increase your running while maintaining a decent lifting plan and eating a ton of food.
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