Most tourists relish the new relationships & viewpoints this close mixing facilitates. Each guest seeks to be known by others as humans have for hundreds of thousands of years. A fundamental human instinct.

Making new LBT friends can be very rewarding ... like discovering gold nuggets in a Yukon Klondyke stream. Most travelers relish the camaraderie of their new friends and recounting of day’s excitement. 

During ‘free-time’ you & your new friends may even share a self-guided walking tour of an Old Town district and dine in a local's recommended restaurant.      Too cool!!!

Such travel experiences may stretch into the future as lifetime friends & memories. My gregarious solo independent traveling friend Sally invariably meets a fellow traveler she afterward travels with on future trips.

 Ironically, a single person on a large bus tour  would have to consciously work hard NOT to meet other guests at meals, during activities or when just driving from site to site.                                                    

Bus Tour Company "Guest Profiles"    
    1. A broad international clientele & age range: Intrepid, Djoser & G-Adventures: —Intrepid is Australian, Djoser is Dutch (but conducts its tours in English), & G-Adventures is Canadian. 

    2. An over-50, all-American crowd: Globus, Cosmos, Overseas Adventure, Trafalgar, Grand Circle, Perillo Tours & Rick Steves Tours.

Note: If it matters to you, most companies will be upfront with this type of information.