A better and more grounded question is not with mountain-sized animals but by comparing a society of humans and small +/-18mm long creatures, which if I didnt mess up my unit conversion again would be 1/100th the size. Lets say intelligent scorpions and fairies live with us. Smart though these creatures would be, would humans really pay enough attention all the time to keep these creatures safe? Just stepping wrong could kill one. You'd have to set up the entire society with safe zones and forced segregation to keep them safe. Such forced segregation wouldnt be much of a society, with very limited area's of contact. At its core you would have dozens of societies living close to each other based on size and potential extra abilities (flight vs walking for example) but with very little contact inbetween, if only for the safety of the smaller one's.
Theres also a huge difference in economical and social capabilities. A human needs much more space in housing and transport than a small creature, but can handle larger things. Still any desk-job for an 18mm size scorpion would earn him the same as a human, but the scorion requires less light, space and infrastructure to function. 802
The desk of one human would already be an entire office building for the tiny creatures. For other jobs like farming a human would be better... as long as automation doesnt factor in. A tractor with a miniature cabin could just as easily be steered by a small creature as a large one.
Could such a society exist? Yes, but it would be a very skewed one. The small creatures would dominate the economical market, requiring less food, space and energy for the same living and workconditions. The larger creatures would be too uneconomical for employers to build offices for and forced into manual labor that is harder to automate by the smaller population. The larger one's would hate how much money they have to pay to just stay alive while the smaller one's will have plenty of stories about accidents where the giants killed smaller one's in one way or another. Hatred and violence would be a key component of such a society, with sects on both sides using poison or brute force to sometimes kill the others. 238