I'm wary of lab-grown food as well - wouldn't make a habit of eating it for a decade or so until any unintended side-effects have come to light. It also puts food production in control of corporations via patents, which is bad for everyone else.
Having said that, the environmental benefits are a big plus and I think it's good for humanity to have the ability to grow food in a lab.
Every time we mess with nature in this way, it backfires.
Were you thinking of specific examples when you said this?
For me "messing with nature" examples there's introducing new species (become invasive) to biomes, pesticides, GMOs, monoculture, etc. Way too many examples to cite.
I don't agree on the environmental aspects either. There is no doubt a tremendous amount of energy will go into creating this meat (the muscles will probably be electrocuted to stimulate real meat texture). It would be more beneficial to pasture cattle like they are meant to rather than set up massive laboratories of artificial lighting, humidity, heat, etc. To create a more "eco-friendly" alternative.
On one hand you are providing resources for an entire living creature to grow to maturity in a semi-natural environment, while it spends energy exercising and feeding, and while generations of muscle cells and supporting cells live and die just to get the most desirable meaty parts when the animal is slaughtered.
On the other hand you just breed the useful cells directly, then pack them together in a way that's acceptable to the human palate.
Other factors aside, if you really think there's any competition regarding resource use, you're entitled to that opinion.
I have to say I am generally weary of technologies trying to replace food like this. Every time we mess with nature in this way, it backfires.