This is absolutely true, but there are two issues. First, it may be too hard for most people to do this. Second, people can try to convey their own reality but it may well be rejected and the people may get sanctioned by society.
People throughout the ages have tried to convey their subjective realities. They paint things that seem strange to us or they propound what seem like strange religious beliefs. But these people must often deal with being ostracized and ridiculed by society.
So, it is possible to do this, but the price may be very high and the benefits very low.