I can only repond on the two points you have brought forward..
1) dietary laws..
Jesus said that it was not what went into a mans mouth that defiled Him, But what came out.. Later the apostles advised not to burden the gentiles with these dietary laws.. They did however advise the gentiles not to eat meat that had been offered to idols..
2) Jesus never rescinded any of the laws against people having sexual relations with people of the same sex..
In the NT we read the following..
Romans 1: KJV
20 "For the invisible things of him from the creation of the world are clearly seen, being understood by the things that are made, even his eternal power and Godhead; so that they are without excuse: {21} Because that, when they knew God, they glorified him not as God, neither were thankful; but became vain in their imaginations, and their foolish heart was darkened. {22} Professing themselves to be wise, they became fools, {23} And changed the glory of the uncorruptible God into an image made like to corruptible man, and to birds, and fourfooted beasts, and creeping things. {24} Wherefore God also gave them up to uncleanness through the lusts of their own hearts, to dishonour their own bodies between themselves: {25} Who changed the truth of God into a lie, and worshipped and served the creature more than the Creator, who is blessed for ever. Amen. {26} For this cause God gave them up unto vile affections: for even their women did change the natural use into that which is against nature: {27} And likewise also the men, leaving the natural use of the woman, burned in their lust one toward another; men with men working that which is unseemly, and receiving in themselves that recompence of their error which was meet. {28} And even as they did not like to retain God in their knowledge, God gave them over to a reprobate mind, to do those things which are not convenient;"
This is talking about people being given over to sexual deviancy. The description is clearly talking about homosexuality and that metal state is reprobate..
So on the first issue Jesus made it clear that eating foods did not make a person immoral or moral and the Apostles later gave only basic guidance to the gentiles on their eating habits.. But on the second issue Jesus never declared homosexuality to not ok and later Paul's letter Romans made it clear that such activity was reprobate and a vile affection and the dishonoring of their bodies..