Weight depends on change in gravity while mass is a constant. so our weight decreases when we r at high altitudes. so it is is clear from this that gravity is changing . so how do people accept that gravity is a constant?
Which people accept that earth's gravity is a constant? It is not, see for instance https://en.wikipedia.org/wiki/Gravity_of_Earth There is a standard gravitational acceleration on earth, ~9.81 ms-2 but as you can see from the link, there is a lot of variation, which is actually used in finding out properties of the interior of the earth.
By the way, wikipedia is a great source of basic information. I would recommend that people go there before asking questions here, or making unjustified assumptions about people.
Simply: on earth's surface (R is about 6371 km), the altitude increase 3190 m lead gravitational acceleration to decrease 0.1%, and this effect can be verified by experiment.
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