Jupiter and the gas giants have solid cores, larger than all of earth. That provide the dense mass needed to keep their gas from floating away. The sun is also mostly gas, and by your reasoning then should also dissipate into space.

Also the van allen/ ionosphere does a hell of allot to keep out atmosphere put.

The reason why the atmosphere ( which do have a tide) isnt as effected by tides as much as the oceans is the fact that gravitational pull is proportional to the masses involved. Therefore the earth oceans have a stronger gravitational pull than the atmosphere. Also due to inverse square law. As the distance between two gravitatioal bodies increse the gravitational force decreases exponentially. So that means that the earths gravitational pull on the atmosphere, oaceans and us is way higer than that of the sun, even though the sun is way bigger, and why we all dont float away.

The tides are a wave. The oceans are not being pulled straigt up and down, they are more sloshing back and forth in rythem with the sun and moons gravitaional influence. Almost like how if you put a glass of water on a table and than tilt the table back and forth sligtly, it would begin to slosh back and forth creating a wave.

Similarly as the reltive strength of the moon and suns gravitational pull rythmically ocillates with the elipical orbit of the moon and rotation of the earth, ( inverse sqare law) it creates just enough force to cause the oceans to slosh a tiny bit - the tides. If this was not true than why are tidal predictions perfecly accurate? Im a captain and use them daily wit zero discrepancy.

Also the tide is highly influenced by ocean topography. In the open ocean the tidal range only a few inches. It is only due to the venturi effect ( the velocity of a fluid increases as it flows through a constriction) that they become pronounced near shore. Thats why the tides in a fjord can be 15 ft + and only a couple feet on a broad open coast.