Woops! "Abstinence" in the fuller sense --- yeah, we are supposed to abstain from meat on all Fridays, unless there is a dispensation, and then you must have another penance that is at least as challenging. It's not enough to say I am using the dispensation because I enjoy meat so much --- you have to have a real reason. Also, we're supposed to follow this on Ember days as well, and of course, Ash Wednesday. After that, we should ALSO aim to mortify our appetites with not always seasoning our food exactly as we would like it, or always eating what we want because it is available. Our Lord says that these types of penances ALONG with prayer (not just prayer alone) are sometimes the only way to rid certain types of devils. Also, it curbs the fighting of one's own flesh against the spirit of God's grace. This obtains an increase in temperance, which then develops into an increase of meekness, chastity, and even eventually fortitude. How cool is that?
Using U.S. rules for the Latin rite (apologies in advance if you are Eastern rite; I don't know their discipline, so I can't comment), the quoted post contains a number of errors regarding the penitential practices:
> yeah, we are supposed to abstain from meat on all Fridays, unless there is a dispensation
This is correct only for Fridays during Lent; Fridays outside of Lent are penitential days: some form of penance is required, but each individual is free to choose this on their own; no dispensation is required.
> and then you must have another penance that is at least as challenging
While this would be meritorious, there is no such requirement.
> It's not enough to say I am using the dispensation because I enjoy meat so much --- you have to have a real reason
When a dispensation is required, it is the responsibility of the priest who grants it whether the reason is sufficient; otherwise, the person is free to choose an alternate penance for whatever reason they choose -- or no reason at all.
> we're supposed to follow this on Ember days as well,
The Ember Days no longer exist on the liturgical calendar. Those who choose to follow the older penitential practices on the former Ember Days are certainly free to do so, and doing so with the proper disposition is meritorious, but doing so is not required. Note that those who attend the traditional Mass, now known as the Extraordinary Form, are not bound to the older law or penitential practices.
> and of course, Ash Wednesday
Ash Wednesday and Good Friday are days of mandatory abstinence and fasting; saying "supposed to follow" the practices on these days may leave the reader with the impression it is strongly suggested but not mandatory.