They can get diseases, but not covid. I have houseplants, and one got a kind of fuzz on it. The garden store had medicine I used to get rid of it. They can also get tiny insects that are bad. These little bugs suck the life out of the plant. These can be killed with sprays.

No it is not possible for that to happen.

If so why then do we sanitize hard surfaces? Wouldn’t plant’s that are touched have same considerations .

found this interesting tidbit online.
If a person handling plants and flowers has been infected with COVID-19 and coughs, sneezes, or even breathes on plants and flowers, virus particles could be deposited on the surface of the leaves, flowers, or stems or on flower boxes or flower containers. It is not known how long the virus particles will live on flowers and plants. Experts are not sure yet if the virus is spread by aerosol or droplets. People who are asymptomatic (approximately 35%) may spread the virus without their knowledge. For this reason, anyone handling plants and flowers should wear a mask to prevent the spread of the disease.

link:
https://endowment.org/covid-19-faqs/

No, plants cannot catch Covid because they don’t have the right kinds of cells, but as @Inspired_2write‘s article says, they can spread it if a person with Covid coughs or sneezes on the plant and another person comes into contact with it. Learn something new every day!