Yes, it is.
Firstly, there is no concrete basis for belief in a shared objective reality, whatsoever. Operating on the assumption that what we perceive is an approximation of reality allows us to arrive at consensus, but it's only an approximation.
Assuming that neuroscience is reasonably accurate, everything you have ever been told, seen, heard, experienced, smelled, tasted, felt or sensed has been filtered through an extremely complicated web of neurons and synapses that is riddled with biases and shortcuts, and hardwired biological processes.
There is no way to know that what you perceive as the colour red is how I perceive the colour red, the only consensus is that we can both distinguish it. Conversely, a colourblind person has an abstract understanding that the concept of "red" exists based upon their own colour perception, but they have no actual concept of red.
The concept of beauty is a lot more complicated than colour perception.
Edit to add: one thing I've noticed of late on the social medias is a number of interesting discussions about inner lives; some people don't have an inner monologue at all, some people cannot close their eyes and "see" things, or visually imagine something. Like if I said "the setting sun glinted on the spears atop the castle battlements as the lord looked across his lands towards the sea", some people would be able to construct a mental image from that, others would not.
